158 lines
4.5 KiB
Go
158 lines
4.5 KiB
Go
// Copyright 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"bytes"
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"context"
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"net"
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"strings"
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"time"
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pb "github.com/GoogleCloudPlatform/microservices-demo/src/productcatalogservice/genproto"
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"cloud.google.com/go/profiler"
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"contrib.go.opencensus.io/exporter/stackdriver"
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"github.com/golang/protobuf/jsonpb"
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"go.opencensus.io/plugin/ocgrpc"
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"go.opencensus.io/trace"
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"google.golang.org/grpc"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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)
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var (
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catalogJSON []byte
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port = flag.Int("port", 3550, "port to listen at")
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)
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func init() {
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c, err := ioutil.ReadFile("products.json")
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if err != nil {
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log.Fatalf("failed to open product catalog json file: %v", err)
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}
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catalogJSON = c
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log.Printf("successfully parsed product catalog json")
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}
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func main() {
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go initTracing()
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go initProfiling("productcatalogservice", "1.0.0")
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flag.Parse()
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log.Printf("starting grpc server at :%d", *port)
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run(*port)
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select {}
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}
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func run(port int) string {
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l, err := net.Listen("tcp", fmt.Sprintf(":%d", port))
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if err != nil {
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log.Fatal(err)
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}
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srv := grpc.NewServer(grpc.StatsHandler(&ocgrpc.ServerHandler{}))
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pb.RegisterProductCatalogServiceServer(srv, &productCatalog{})
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go srv.Serve(l)
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return l.Addr().String()
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}
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func initTracing() {
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// TODO(ahmetb) this method is duplicated in other microservices using Go
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// since they are not sharing packages.
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for i := 1; i <= 3; i++ {
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exporter, err := stackdriver.NewExporter(stackdriver.Options{})
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if err != nil {
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log.Printf("info: failed to initialize stackdriver exporter: %+v", err)
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} else {
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trace.RegisterExporter(exporter)
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trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
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log.Print("registered stackdriver tracing")
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return
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}
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d := time.Second * 10 * time.Duration(i)
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log.Printf("sleeping %v to retry initializing stackdriver exporter", d)
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time.Sleep(d)
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}
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log.Printf("warning: could not initialize stackdriver exporter after retrying, giving up")
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}
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func initProfiling(service, version string) {
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// TODO(ahmetb) this method is duplicated in other microservices using Go
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// since they are not sharing packages.
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for i := 1; i <= 3; i++ {
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if err := profiler.Start(profiler.Config{
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Service: service,
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ServiceVersion: version,
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// ProjectID must be set if not running on GCP.
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// ProjectID: "my-project",
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}); err != nil {
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log.Printf("warn: failed to start profiler: %+v", err)
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} else {
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log.Print("started stackdriver profiler")
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return
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}
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d := time.Second * 10 * time.Duration(i)
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log.Printf("sleeping %v to retry initializing stackdriver profiler", d)
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time.Sleep(d)
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}
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log.Printf("warning: could not initialize stackdriver profiler after retrying, giving up")
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}
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type productCatalog struct{}
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func parseCatalog() []*pb.Product {
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var cat pb.ListProductsResponse
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if err := jsonpb.Unmarshal(bytes.NewReader(catalogJSON), &cat); err != nil {
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log.Printf("warning: failed to parse the catalog JSON: %v", err)
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return nil
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}
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return cat.Products
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}
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func (p *productCatalog) ListProducts(context.Context, *pb.Empty) (*pb.ListProductsResponse, error) {
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return &pb.ListProductsResponse{Products: parseCatalog()}, nil
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}
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func (p *productCatalog) GetProduct(ctx context.Context, req *pb.GetProductRequest) (*pb.Product, error) {
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var found *pb.Product
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for i := 0; i < len(parseCatalog()); i++ {
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if req.Id == parseCatalog()[i].Id {
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found = parseCatalog()[i]
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}
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}
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if found == nil {
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return nil, status.Errorf(codes.NotFound, "no product with ID %s", req.Id)
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}
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return found, nil
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}
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func (p *productCatalog) SearchProducts(ctx context.Context, req *pb.SearchProductsRequest) (*pb.SearchProductsResponse, error) {
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// Intepret query as a substring match in name or description.
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var ps []*pb.Product
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for _, p := range parseCatalog() {
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if strings.Contains(strings.ToLower(p.Name), strings.ToLower(req.Query)) ||
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strings.Contains(strings.ToLower(p.Description), strings.ToLower(req.Query)) {
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ps = append(ps, p)
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}
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}
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return &pb.SearchProductsResponse{Results: ps}, nil
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}
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